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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2df9e331e0ed15f9376165940e662c9b757896fc100f411e4732a8d7605c37' 
  AND token = 'aJvK4Pmmb064msXe1bddUeqQuhXQ2fKj+BHgHkIMDb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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