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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80cc24d9ff33297a2d78d520f53f9a34f095456fb8918760b119c1bd88dacac' 
  AND token = 'eFHFSXAEzEoaLNraztP5qVTRG1n2w5O1Mllev3Kt0ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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