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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1a987cb65a8282f730b4fc451a3fe2efdea03341532f46bd15c94f99cb5cb7' 
  AND token = 'RmYL0iTPltXXcgoUymElgTvg7rT2knmPFYob8Hn129Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}