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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384761bbc08b381c15b0c7ad61ac584f5998037966cb9e0efad4735879eac19a' 
  AND token = 'UPQhyx+ebMouap72NRbjMeixgBVOr9Wl0j4Aa+r/iJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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