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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6dd57c222c344a60d7dbdfb8f924f05655e1e61d038679f3ab43db453802d44' 
  AND token = '0ogOJ0K7/AFCTlk4FFE5JMvHSFu6FTrxYS4gCmwb2h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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