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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2e5b012db50b7606cf887afbbc8278fc3390719ff07ba909ffb4e6e725c8b1' 
  AND token = 'WynO9g093QtGwWXP67pbEmqEjCEf7FvAiGn19/uJt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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