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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34100bf79eb8f5ecd3ba9fba51e26469ae05a64baf71d429dbbba2d8e8a83917' 
  AND token = 'tvlwNeTYlAmzFIX0rlE8GNxL2s7VfAbsP+auLreufkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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