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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f9c19becb1168a36565336b39ef14831b202a247f4eb2df99166112a05e207' 
  AND token = 'S9dDyX5H/rYc8q0x9vndmfAaIxM9klLnl+AGhm5hLuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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