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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99cd54663e8f9f5a5ed89654f0c7b7296f489a8f25b3a3727f42040d0f3989b' 
  AND token = '0h9Ljd6SLGuZlPSQWHKjBaLauqFJS0MA0EaarUH3FEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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