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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2571239a7f4f19c2a913dc4b670c0e8b4710c96a3e013e28942f877dc604d3ae' 
  AND token = 'vy1anFWHXMHQjlYqmSq2oIqD/zWh7WrXvoniKrPHSXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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