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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f57b66e27020faa01c912fed2c0f9be454d31efddfc385774d78252a018a430' 
  AND token = 'MUAwKJvjuygycq+8ijw4mK1J+WkdN1PxuJ40qLlq57M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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