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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbe7bcb4add6ca4120e7816be3b8ab710b76e84b6afc8aa289a5ed82649aec6' 
  AND token = 'xEamdgZ3WGcaW5ADcRI2Vmie97m/oqW7+jgkNKV4oZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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