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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b92e8382f36949b68c8315c09c02c6c37daa893a88d2b73984946b6647b8d17' 
  AND token = 'DDxYMc4H2Cxk/VHOjMeunk1pXFat8qRat5WiAbp7bPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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