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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5c5931348418f13448f218fabf68d8430e3350dcd05646d40ceacbe0d0c247' 
  AND token = 'O0Zx4QzBG00Wn7uV5TO+Xo5mofN4ZJypYjFk8v+K5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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