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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24622cc6259a7a9fd28e9a5f94e8c53d961bf0d3e9e20899518b3389f96cb6fd' 
  AND token = 'c28++jqvy0/cSvu24wioSp+v+qZniU+ngP4yQTsUJCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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