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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5365c07ee6674072d0eb3efcfefc69d31507c47979fd54e3dea30cc601455f42' 
  AND token = 'AbN7s96w74hRCrGN3oHX3cDcpjtd8dlQ9N/yXlDZkZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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