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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5039d8d203203d7c82b50615605e5598fef07b630ba42205fe551afe8d5d7a' 
  AND token = 'GaR6fUvTLKGuKtBcB257508UbQj//XVjSqO4rL1dZxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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