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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1100e1baeab13cde5da1e5a253a25868c6fa5e1b0eda7fe4836bbf6c14e67fc' 
  AND token = '6b5mLxcPug2fRQqinIoGb04LgMLeUlmn3wOWWhADPPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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