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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118a3fe69b3cc4528d4dd3d5bad360829d15578e92dc5b762daf22f94b5f618e' 
  AND token = 'g53yCtawV2RG7eZ9eeP+pr49RsLbl4agTeBEDUIqXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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