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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7516a659619dd4f46e4bf0efce198541b19db6be2872164eaca640cc66a27ed' 
  AND token = 'Luxrh5Z5U3jOSpQY6jnSXNSU8WbshSK9yHlN4FVWVoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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