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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cbdf328be6b4b9b3cf5899c437d8e0ac5fcf28ce164b27eb802bcdc55f8c14' 
  AND token = '1j6c8/Iouheiq2y8+yYMRyB/Rl77EvUKoqWE6str9F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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