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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a09ab5510d93aa074762cd919a67e093cd9d5746f1b6b867e13f1dc7ee44d6' 
  AND token = 'urCxIGgFJ+i75kT/wP9WHa6+inKTwI2+V4wp2Qty8Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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