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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4af951b1c3053865ae8a1e4334cb7148158b7d388500f2daf0d7c0679138b54' 
  AND token = 'oLVriGjG5Q2ExfrSfP8uniZ21QrufI8dMOxJ4SJOwIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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