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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f90a2167052e8ac996edb727f6fc90d6b876bb40ecf1143631a5671f7276c5' 
  AND token = 'M0XVX7fJs8LZ86v7VtT3hn9WCehCSJH1V5ArNp0cNYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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