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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4bc0626d0238745c2ebe94d807e0795d406a84395152b1dc38332c01680b20' 
  AND token = 'TQCIP9Xg1ikP0WuOAZa+ufp8IjX8FU4C8JiyKmCGUYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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