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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd81ec25226719445977008b92c6dab21de9897f8ae67488649d901d3a366581' 
  AND token = 'PIy7o8TXFu/sLZKckSGIMH7IvQLLnZLtdW9pyj+TU6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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