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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318e2e98c7dd166c3874a9d712507fc4cdbdb1d9fdce5d4c1bdd2f33c997b29d' 
  AND token = 'Ro7VTe6GFCkRLr33H1hs8Ukcbt3mNAwyQUYYw6y/sw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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