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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d0f3f6df9175176f8911ec6474709d4b0e1d79bdc9425ba765b3cf98612294' 
  AND token = 'X62MSzNdGuTynIsHbRmrXJTeYOBgxQZ2J74e2IcDx88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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