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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35eec1c7245e87cf3c3af61229e5a06cccf8c48330dfb6b7071baf2ae0bf43c4' 
  AND token = 'WWuOgEJwWlMCAf7Smn52yv+Dk1weaXoE3BKM2aQAJmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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