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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305ab1677c78b4fb398b3aac0c12a7b2664988641e2a3e4755c563ff4ddb7561' 
  AND token = 'aTPrppddP3KEUT1RbZUmmp4De6MXbgSxgkNX5tLc3O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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