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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d3a8c2443c039dc2ec1a93042970accd0ab51537d2421c9d8fd8ed05ed4bcd' 
  AND token = 'X3KeSkLe8+HOCqf5ABNNuQepibztcphXm0pT14I8m1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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