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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24129ed4b8a5bd39a3d1013691fd6e8ac05456544e5aad3cfe0e7314e5d9d9d' 
  AND token = 's03ptlH37FArAtxJfLEywOM2Yne+rez8xGJlY4tIMTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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