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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cdd04f636cd8b7330b70600ae7b109355e2360e7db65616b8626dfd862ff7c' 
  AND token = 'M7VRODwe1gMEaFf19W3OKGk06sQCnxneb5y9E2gip7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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