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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1896331bc89c1fd677f8ce399886bfb5939ba0cf91cc8994742259ae82adfe06' 
  AND token = 'ZaMTAIULL6eIu5d9XG8DZjgZhu3X/DHDxvxkmR1VdGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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