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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0b3ea90afe0ae0935443449609a162d2941e90cd18c0067a924a4ac6dc61a7' 
  AND token = '9XmevUnauYYrj2S4i074grCdDI8feZocD3kDbpXWC0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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