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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826e7312c61c53226ce29a6e394a97dc14b32ddb5970a4cc28f9f013777988fd' 
  AND token = 'u9hH+EWCan6LP6/tFNItiWyANBXcQeiXLN8UTwwpEG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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