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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23262118fbad48170581f8f3853d4f20973cc3b9f56a52c5bbc524be6a9d9232' 
  AND token = '1vQObPb3OdS60gXZrxNwKtdI7LA4KQ4xk3tNaos2HKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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