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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6860ac5152d3781c0976c2376f250f3fb2390af6c330476ef20c477dfe863119' 
  AND token = 'G3TjedB4PmEhWvhnlkyB+PmNuAauGICZskBMHKG28k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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