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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f10513ee5a47a42be2a39e20451b6d3bd7806fda9e5ae9c7e591283c0ea4bf' 
  AND token = 'HeASIGrMnjaez0b8v4zCSLZT9m5WFfxXsMYAZv6x364=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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