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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35ee9023338bbe19ea830b29d5e3fbd783b842a5140df9090f19b158023bced' 
  AND token = 'vqw+IlL6HxefkrM+AX6BuShqXCkdHkCbi+yWBX+GwCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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