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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d6fe2ccf802d89030545ea39bca1bffc1578fa69cf4a9fb8f8c8c8f194b5ef' 
  AND token = 'BSnvYmIxMlOh8Ys/2Dg2r9yYm+sfbZElCzDyLrIJmH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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