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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051d961b00964301928026a49ae38f1a73596bdd5ec2058a4e85a5427c088ca1' 
  AND token = 'lMZnRZzlwhMziKwaUf0i4qC7afwT9/lB4LMwWaSHbJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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