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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6f3839458752b7a68e635960bff50140c03b437b9ef3c8c3ba99c87f0f0e76' 
  AND token = 'WhcERIFf0e3MGyxb8aC1vFx+wbxONS214pjYfC67qOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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