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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc7d38b38e32df58ecc7e888a5a3548ede571991ba304326b4dc23a81d78688' 
  AND token = 'KbM1oc5XvI7wqSiZHut8ZVyx/9pnurcFTkDmfKUMT/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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