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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbf3cd66016554bbabc95f34987f3c331b5269a2eb133c5e68d36c9032ee4ad' 
  AND token = 'eaq79NewuupO1tfV4Yqy6f/FAajDLpeYZ5qHt+g5c6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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