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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36811c1e74238ac8792a8cad00d1af4467fe10579960487c55dbc53563d0b22' 
  AND token = 'i+SJL10Cb9hcLgh4Oia9X8EXDF1ntJeK3g/9lQMV3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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