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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63e405f896c60e1578e91fb66f7e09408fc85dbe63489de133e0877083136dd' 
  AND token = 'E6LJyVELpFhQif6FgwMZFC/No4E8+q4lG5S1xQSBf60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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