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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6796311a36321a810d9f8c8aff6078e9fcc36de294c43f76190b9b48c0a219fe' 
  AND token = 'Hlf2amSg0Ob+fnfiRI+CF/5Vgri4o9QGvPj3q/n0dH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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