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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300ea7565a45964c4eeb0b35bbf953fcbf3368318aa7ffb95858cc25156bf3b1' 
  AND token = 'nbFqI3Lv11ASRDtboY7q8u566YgQLytWauyxIZoXU5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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