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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b95e5cf0b86f572113e3eb33c6760c15fcdaf4c0e2d81802e6fafb3a7cf8b5' 
  AND token = 'jn8qrPa00QiTH4NCkDai9H6XmXANzrZLGdt9RwnMruA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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