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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b361c1edbd02282cb8ca5cbcb79d8d83f9fe538490dabf4572a82959eed2424' 
  AND token = 'LxA8oPvoMyKly03Azt6wEAs7DLaojcg4Bo34qB0fW/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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