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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c258e6adde43f45d08de06dc02d590702d42cad8a5043beff30fd8b80d3b444e' 
  AND token = '/UONynuy3qlvs+/v5zSmyadjybSCrI38SZoHbwI9VIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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